Storyboard decision coverage

1. Decision points

2. IF amount
>1000 THEN
assess by
supervisor
IF not in
stock THEN
order
IF number of
books > 8 OR
sum ≥ 100
THEN extra
discount
A decision point is a a combination of one or more conditions
that define the conditions for the various possibilities in the
subsequent system behaviour.

3. IF number of
books > 8
THEN extra
discount

4. IF number of
books > 8
THEN extra
discount
Test situations
Number of books
Result

5. Test situations 1 2
Number of books >8 ≤8
Result true false
IF number of
books > 8
THEN extra
discount
Singular conditions lead to
2 test situations

6. Test situations 1 2
Number of books >8 ≤8
Result 1 0
IF number of
books > 8
THEN extra
discount
In Boolean algebra a “1” is
used to represent “true”

7. Test situations 1 2
Number of books >8 ≤8
Result 1 0
IF number of
books > 8
THEN extra
discount
In Boolean algebra a “0” is
used to represent “false”

8. Decision points may consist
of a combination of
conditions
IF number of
books > 8
OR
sum ≥ 100
THEN extra
discount
IF number of
books > 8
THEN extra
discount

9. A B
IF number of books > 8 OR sum ≥ 100 THEN extra discount

10. IF number of books > 8 OR sum ≥ 100 THEN extra discount
Abbreviated notation
A OR B

11. IF number of books > 8 AND sum ≥ 100 THEN extra
discount
IF number of books > 8 OR sum ≥ 100 THEN extra discount
Abbreviated notation
A OR B
Abbreviated notation
A AND B

12. Complete
decision table
A B
1 1
1 0
0 1
0 0
Based on two conditions we
get these possible
combinations

13. A B
1 1
1 0
0 1
0 0
The end result depends on
the operators AND and OR

14. Truth table
A B A OR B
1 1 1
1 0 1
0 1 1
0 0 0
With the operator OR the end
result is ONLY false when
both conditions are false
This table shows the outcome
of all situations of a full
decision tale. Such a table is
called a truth table.

15. Truth table
A B A AND B
1 1 1
1 0 0
0 1 0
0 0 0
Truth table
A B A OR B
1 1 1
1 0 1
0 1 1
0 0 0
With the operator AND the
end result is ONLY true when
both conditions are true

16. Truth table
A B C (A AND B) OR C
1 1 1 1
1 1 0 1
1 0 1 1
1 0 0 0
0 1 1 1
0 1 0 0
0 0 1 1
0 0 0 0
A combined decisionthere
may be different operators.
When there are no brackets
AND proceeds OR